- Apr 6, 2018
Hi all. Found this site after seeing some video on HBPowerwall on Youtube, Great stuff btw. Anyhow my project. So far I have a 40W panel facing SW, Not great but that the only place I can mount it to the outside wall. This 40W panel feed's a cheap PWM solar controller. which is charging a 12V 7Ah Lead acid battery. a MoPi is used to connect the 12V power from the battery to the Raspberry pi. The Mopi is set to shutdown at 11V. Anyhow because I have some old laptop. I've pulled apart the battery's for the 18650. And I need to test them all. But my plan is to replace the 2 year old lead acid battery with the 18650's. So far I have 20 18650's. And i'm not sure to make a 4S4P or a 7S2P, and figure out how I can run it on 24V.